McDonald's has quietly reduced the size of its popular McFlurry ice cream desserts in a trial to offer fast food fans lower-calorie treats.

The fast food giant has replaced the regular 99p McFlurry with a 'reduced size' dessert that is 10p cheaper and about 12 per cent smaller in more than 60 branches, mostly in London.

It has also introduced a new Mini size that has less than half the calories of the regular size McFlurry. It is thought to be about half the size, and costs just 59p for the core flavours.

McDonald's is trialling a reduced size McFlurry which has replaced a regular 99p McFlurry in 60 or so branches in and around London (left). It is also selling a Mini McFlurry that is half the calories and costs 59p (right)

Where the reduced size McFlurry is on sale, customers will not be able to buy the regular size McFlurry, which applies to every flavour the fast food giant sells.

However to sweeten the deal, McDonald's has brought back its popular Maltesers flavour as a limited edition treat, which is driving many customers wild on social media.

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McDonald's has replaced the regular size McFlurry with the reduced size version and introduced a new mini size as part of a 'test' to offer customers 'more choice,' a McDonald's spokesman said in a statement.

However in 31 locations, only the reduced size McFlurry will be available.

McDonald's has brought back one of its most popular McFlurry flavours, Maltesers, to sweeten the deal. However all McFlurry flavours will be reduced in size at the branches taking part in the trial, including Dairy Milk (right)

McDonald's is also selling a new Mini McFlurry in about 30 branches. It contains half the calories of a regular McFlurry and costs 59p or 89p depending on the flavour

Fast food fans will still be able to buy a regular size McFlurry at branches not taking part in the trial, including the limited edition Maltesers treat.

The reduced size McFlurry has about 12 per cent fewer calories than the regular size. The regular Maltesers McFlurry for example has 404 calories, compared to 357 in the reduced size version.

The Mini Maltesers McFlurry has just 178 calories.

The reduced size also has 12 per cent fewer sugar than the regular.

The new Maltesers flavour is slightly pricier than the normal McFlurry flavours, with a Mini costing 89p, a Reduced Size costing £1.29 and a regular costing £1.39.

Fast food fans are excited for the return of a Maltesers McFlurry on social media

A McDonald's spokesman told FEMAIL: 'As part of our commitment to offering customers more choice we are currently trialling a new Mini McFlurry as well as a Reduced Size McFlurry across our core range and current promotional Maltesers McFlurry.

'In the restaurants taking part in the trial, the Mini McFlurry and Reduced Size McFlurry will replace the standard size.

When asked if the reduced size McFlurry will permanently replace the regular McFlurry, or be an additional option for customers after the trial, a McDonald's spokesman said: 'This will be determined once the trial has taken place.'